<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div {
            width: 100px;
            height: 50px;
            background-color: #de1515;
        }

        span {
            width: 100px;
            height: 50px;
            background-color: #1fb686;
        }
    </style>
</head>
<body>
<div>盒子1</div>
<div>盒子2</div>
<div>盒子3</div>
<hr>
<span>文本1</span>
<span>文本2</span>
<span>文本3</span>
<span>文本4</span>
<hr>
<header>头部</header>
<nav>导航栏</nav>
</body>
</html>
